package payment

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
)

type PayResult struct {
	Success   bool
	PaymentID uint
	TradeNo   string
	PayURL    string
}

type RefundResult struct {
	Success  bool
	RefundID uint
	RefundNo string
}

// 处理支付
func ProcessPayment(method string, paymentID uint, amount float64) (*PayResult, error) {
	switch method {
	case "alipay":
		return processAlipayPayment(paymentID, amount)
	case "wechat":
		return processWechatPayment(paymentID, amount)
	default:
		return nil, fmt.Errorf("unsupported payment method")
	}
}

// 处理支付宝支付
func processAlipayPayment(paymentID uint, amount float64) (*PayResult, error) {
	// 实现支付宝支付逻辑
	// TODO: 集成实际的支付宝SDK
	return &PayResult{
		Success:   true,
		PaymentID: paymentID,
		PayURL:    "https://alipay.com/pay/123",
	}, nil
}

// 处理微信支付
func processWechatPayment(paymentID uint, amount float64) (*PayResult, error) {
	// 实现微信支付逻辑
	// TODO: 集成实际的微信支付SDK
	return &PayResult{
		Success:   true,
		PaymentID: paymentID,
		PayURL:    "weixin://pay/123",
	}, nil
}

// 处理支付宝回调
func HandleAlipayCallback(r *http.Request) PayResult {
	// 实现支付宝回调验证逻辑
	// TODO: 实现实际的回调验证
	var callbackData struct {
		OutTradeNo string `json:"out_trade_no"`
		TradeNo    string `json:"trade_no"`
		Status     string `json:"status"`
	}

	if err := json.NewDecoder(r.Body).Decode(&callbackData); err != nil {
		return PayResult{Success: false}
	}

	// 将 out_trade_no 转换为 paymentID
	paymentID, err := strconv.ParseUint(callbackData.OutTradeNo, 10, 64)
	if err != nil {
		return PayResult{Success: false}
	}

	return PayResult{
		Success:   true,
		PaymentID: uint(paymentID),
		TradeNo:   callbackData.TradeNo,
	}
}

// 处理微信回调
func HandleWechatCallback(r *http.Request) PayResult {
	// 实现微信回调验证逻辑
	// TODO: 实现实际的回调验证
	var callbackData struct {
		OutTradeNo string `json:"out_trade_no"`
		TradeNo    string `json:"trade_no"`
		Status     string `json:"status"`
	}

	if err := json.NewDecoder(r.Body).Decode(&callbackData); err != nil {
		return PayResult{Success: false}
	}

	// 将 out_trade_no 转换为 paymentID
	paymentID, err := strconv.ParseUint(callbackData.OutTradeNo, 10, 64)
	if err != nil {
		return PayResult{Success: false}
	}

	return PayResult{
		Success:   true,
		PaymentID: uint(paymentID),
		TradeNo:   callbackData.TradeNo,
	}
}

// 处理退款
func ProcessRefund(method, tradeNo string, refundID uint, amount float64) (*RefundResult, error) {
	switch method {
	case "alipay":
		return processAlipayRefund(tradeNo, refundID, amount)
	case "wechat":
		return processWechatRefund(tradeNo, refundID, amount)
	default:
		return nil, fmt.Errorf("unsupported payment method")
	}
}

// 处理支付宝退款
func processAlipayRefund(tradeNo string, refundID uint, amount float64) (*RefundResult, error) {
	// 实现支付宝退款逻辑
	// TODO: 集成实际的支付宝SDK
	return &RefundResult{
		Success:  true,
		RefundID: refundID,
		RefundNo: fmt.Sprintf("refund_%s_%d", tradeNo, refundID),
	}, nil
}

// 处理微信退款
func processWechatRefund(tradeNo string, refundID uint, amount float64) (*RefundResult, error) {
	// 实现微信退款逻辑
	// TODO: 集成实际的微信支付SDK
	return &RefundResult{
		Success:  true,
		RefundID: refundID,
		RefundNo: fmt.Sprintf("refund_%s_%d", tradeNo, refundID),
	}, nil
}
